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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

80 kA
20 kA
60 kA
35 kA

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The power loss is an important factor for the design of

motor
transmission line
generator
feeder

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In a single bus-bar system there will be complete shut down when

two or more faults occur simultaneously
fault occurs with respect to earthing
fault occurs on neutral line
fault occurs on the bus itself

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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is

1500/√3 A
750 A
1500 A
None of these

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SF 6 gas

Is nontoxic
has pungent small
is lighter than air
is yellow in colour

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The rated secondary current of current transformer for relays is generally

5 A
10 A
20 A
30 A

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